Sams Teach Yourself C++ in 21 Days

70:

71: return pType[0]; // appease MFC

72: }

73:

74: int main()

75: {

76: try

77: {

78: Array intArray(0);

79: for (int j = 0; j < 100; j++)

80: {

81: intArray[j] = j;

82: cout << “intArray[“ << j << “] okay...” << endl;

83: }

84: }

85: catch (Array::xBoundary)

86: {

87: cout << “Unable to process your input!” << endl;

88: }

89: catch (Array::xTooBig)

90: {

91: cout << “This array is too big...” << endl;

92: }

93:

94: catch (Array::xTooSmall)

95: {

96: cout << “This array is too small...” << endl;

97: }

98: catch (Array::xZero)

99: {

100: cout << “You asked for an array”;

101: cout << “ of zero objects!” << endl;

102: }

103: catch (...)

104: {

105: cout << “Something went wrong!” << endl;

106: }

107: cout << “Done.” << endl;

108: return 0;

109: }

This array is too small...

Done.

The significant change is on lines 27–30, where the class hierarchy is estab-

lished. Classes xTooBig,xTooSmall, and xNegativeare derived from xSize, and

xZerois derived from xTooSmall.

OUTPUT

734 Day 20

LISTING20.6 continued

ANALYSIS